#include <iostream>

class Vector{

	public:

		const int _dc = 1;

		int _capacity;

		int _size;

		int *_data;

		Vector()
		{
			_capacity = _dc;

			_size = 0;

			_data = new int[_capacity];
		}

		void push(int key)
		{
			if(_capacity == _size)
			{
				_capacity += _dc;

				int *_temp = new int[_capacity];

				memcpy(_temp, _data, sizeof(int) * _size);

				delete []_data;

				_data = _temp;
			}
			_data[_size] = key;

			_size++;
		}

		class iterator{

			public:

				int *current;

				iterator(int *temp)
				{
					current = temp;
				}

				bool operator <=(iterator other)
				{
					return current <= other.current;
				}

				bool operator >=(iterator other)
				{
					return current >= other.current;
				}

				iterator& operator ++()
				{
					this->current++;

					return *this;
				}

				iterator operator ++(int)
				{
					iterator i = *this;

					current = ++current;

					return i;
				}

				iterator& operator --()
				{
					this->current--;

					return *this;
				}

				iterator operator --(int)
				{
					iterator i = *this;

					current = --current;

					return i;
				}

				int operator *()
				{
					return *current;
				}
		};

		iterator begin()
		{
			return iterator(_data);
		}

		iterator end()
		{
			return iterator(_data + _size - 1);
		}
};

int main()
{
	Vector vector;

	vector.push(20);

	vector.push(50);

	vector.push(80);

	vector.push(90);

	vector.push(15);

	for(Vector::iterator i = vector.begin(); i <= vector.end(); ++i)
	{
		if ((*i) < 30){
		std::cout << "30" << " ";
		}


		else if (((*i)>=30)&&((*i)<=60)){
		std::cout << "40" << " ";
		}


		else std::cout << "60" <<" ";

	}
	return 0;
}